Two-dimensional oblique detonation waves in a hydrocarbon-air mixture induced by a wedge are simulated by using the reactive multi-species Navier-Stokes equations coupled with a Lagrangian point mass model. The focus of this investigation is the effects of evaporating fuel droplets on the oblique shock-to-detonation transition. The fuel is applied as n-decane for the jet fuel surrogate. The n-decane vapors, mixtures of vapors and droplets and atomized droplets are used as the fuel to investigate the transition patterns, respectively. It is found that the change of fuel from vapors to droplets results in a shift from a smooth transition to an abrupt transition, and the characteristic length of initiation process for the oblique detonation becomes longer. As initial droplet size increases, a smooth detonation surface is found due to the interaction between the evaporating droplets and the detonation wave.
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